Pro JPA 2: Mastering the Java™ Persistence API

Chapter 15. Migration

Now that JPA has been explained in detail, your challenge is deciding how and when to adopt the new persistence model. For new applications, this is not an issue, but what about existing applications? In this chapter we will look at the challenges facing developers who want to integrate JPA into legacy applications and offer some solutions to help ease the transition.

Terminology Check

Recall that JPA objects are called entities, not beans. The term entity beans refers to objects that were created using EJB 2.1-style container-managed persistence (CMP). Mixing these terms up will inevitably put you in a confused and unhappy state throughout this chapter.

Migrating from CMP Entity Beans

Until the publication of the EJB 3.0 specification ...